2020 Maths paper1.

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AO1 AO1.1a Select routine procedures AO1.1b Correctly carry out routine procedures AO1.2 Accurately recall facts, terminology and definitions AO2 AO2.1 Construct rigorous mathematical argumen ... ts (including proofs) AO2.2a Make deductions AO2.2b Make inferences AO2.3 Assess the validity of mathematical arguments AO2.4 Explain their reasoning AO2.5 Use mathematical language and notation correctly AO3 AO3.1a Translate problems in mathematical contexts into mathematical processes AO3.1b Translate problems in non-mathematical contexts into mathematical processes AO3.2a Interpret solutions to problems in their original context AO3.2b Where appropriate, evaluate the accuracy and limitations of solutions to problems AO3.3 Translate situations in context into mathematical models AO3.4 Use mathematical models AO3.5a Evaluate the outcomes of modelling in context AO3.5b Recognise the limitations of models AO3.5c Where appropriate, explain how to refine models Examiners should consistently apply the following general marking principles No Method Shown Where the question specifically requires a particular method to be used, we must usually see evidence of use of this method for any marks to be awarded. Where the answer can be reasonably obtained without showing working and it is very unlikely that the correct answer can be obtained by using an incorrect method, we must award full marks. However, the obvious penalty to students showing no working is that incorrect answers, however close, earn no marks. Where a question asks the student to state or write down a result, no method need be shown for full marks. Where the permitted calculator has functions which reasonably allow the solution of the question directly, the correct answer without working earns full marks, unless it is given to less than the degree of accuracy accepted in the mark scheme, when it gains no marks. Otherwise we require evidence of a correct method for any marks to be awarded. Diagrams Diagrams that have working on them should be treated like normal responses. If a diagram has been written on but the correct response is within the answer space, the work within the answer space should be marked. Working on diagrams that contradicts work within the answer space is not to be considered as choice but as working, and is not, therefore, penalised. Work erased or crossed out Erased or crossed out work that is still legible and has not been replaced should be marked. Erased or crossed out work that has been replaced can be ignored. Choice When a choice of answers and/or methods is given and the student has not clearly indicated which answer they want to be marked, mark positively, awarding marks for all of the student's best attempts. Withhold marks for final accuracy and conclusions if there are conflicting complete answers or when an incorrect solution (or part thereof) is referred to in the final answer. Q Marking instructions AO Marks Typical solution 1a Circles the correct answer 1.1b B1 9 |?| < 2 Subtotal 1 1b Circles the correct answer 1.1b B1 3 Subtotal 1 Question Total 2 Q Marking instructions AO Marks Typical solution 2 Circles the correct answer 2.3 R1 1 ??(?) = ? Total 1 Q Marking instructions AO Marks Typical solution 3 Circles the correct answer 2.2a R1 1 Total 1 Q Marking instructions AO Marks Typical solution 4(a) Sketches an inverted V shape graph Condone lack of symmetry 1.1a M1 Sketches an inverted V shape in the correct quadrants Condone lack of symmetry or absence of curve to the left of ( 0 , - 2 ) 1.1b A1 Correctly labels all three intersections with coordinate axis. Accept the coordinates of each point or x values on x axis and y value on y axis Ignore any other values 1.1b A1 Total 3 4(b) Obtains at least one correct critical value using a correct method. Can be read off graph or calculator Condone use of equals or incorrect inequality sign 1.1a M1 2 < ? < 4 Writes correct solution in a correct form Accept x > 2 , x < 4 or ( 2 , 4 ) 1.1b A1 Subtotal 2 Question Total 5 ..............................................CONTINUED...................................... [Show More]

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